Roman Emperor Pertinax is assassinated by Praetorian Guards, who then sell the throne in an auction to Didius Julianus.

PertinaxAssassinationPraetorian GuardAuctionDidius Julianus

Roman Emperor Valentinian I appoints his brother Flavius Valens co-emperor.

Valentinian IValensEmperor

The foundation stone of Valletta, Malta's capital city, is laid by Jean Parisot de Valette, Grand Master of the Sovereign Military Order of Malta.

VallettaMaltaJean Parisot de ValetteList of Grand Masters of the Knights Hospitaller

Juan Bautista de Anza finds the site for the Presidio of San Francisco.

Juan Bautista de AnzaPresidio of San Francisco

Allies under Prince Josias of Saxe-Coburg-Saalfeld defeat French forces at Le Cateau.

Prince Josias of Saxe-Coburg-SaalfeldBattle of Le Cateau (1794)Le Cateau-Cambrésis

Partitions of Poland: The Duchy of Courland and Semigallia, a northern fief of the Polish-Lithuanian Commonwealth, ceases to exist and becomes part of Imperial Russia.

Partitions of PolandDuchy of Courland and SemigalliaFiefPolish-Lithuanian CommonwealthImperial Russia

Treaty of Florence is signed.

Treaty of Florence

Heinrich Wilhelm Matthäus Olbers discovers 2 Pallas, the second asteroid ever to be discovered.

Heinrich Wilhelm Matthäus Olbers2 PallasAsteroid

Peninsular War: France defeats Spain in the Battle of Medellín.

Peninsular WarBattle of Medellín

War of 1812: In the Battle of Valparaíso, two American naval vessels are captured by two Royal Navy vessels of equal strength.

War of 1812Battle of Valparaíso

First concert of the Vienna Philharmonic Orchestra, founded by Otto Nicolai.

Vienna PhilharmonicOtto Nicolai

Crimean War: France and Britain declare war on Russia.

Crimean War

First Taranaki War: The Battle of Waireka begins.

First Taranaki War

American Civil War: In the Battle of Glorieta Pass, Union forces stop the Confederate invasion of the New Mexico Territory. The battle began on March 26.

American Civil WarBattle of Glorieta PassUnion (American Civil War)Confederate States of AmericaNew Mexico Territory

The Paris Commune is formally established in Paris.

Paris Commune

Tonkin Campaign: French victory in the Battle of Gia Cuc.

Tonkin CampaignBattle of Gia Cuc

Henri Fabre becomes the first person to fly a seaplane, the Fabre Hydravion, after taking off from a water runway near Martigues, France.

Henri FabreSeaplaneFabre HydravionMartigues

Palm Sunday tornado outbreak of 1920 affects the Great Lakes region and Deep South states.

Palm Sunday tornado outbreak of 1920Great LakesDeep South

The Imperial Airways biplane City of Liverpool is believed to be the first airliner lost to sabotage when a passenger sets a fire on board.

Imperial AirwaysSabotage1933 Imperial Airways Diksmuide crash

Spanish Civil War: Generalissimo Francisco Franco conquers Madrid after a three-year siege.

Spanish Civil WarGeneralissimoFrancisco FrancoMadridSiege of Madrid

World War II: Britain's Mediterranean Fleet sinks three heavy cruisers and two destroyers of Italy's Regia Marina.

World War IIMediterranean FleetBattle of Cape MatapanRegia Marina

World War II: A British combined force permanently disables the Louis Joubert Lock in Saint-Nazaire in order to keep the German battleship Tirpitz away from the mid-ocean convoy lanes.

Combined Operations HeadquartersSt Nazaire RaidLouis Joubert LockSaint-NazaireGerman battleship Tirpitz

Cold War: The United States Department of State releases the Acheson-Lilienthal Report, outlining a plan for the international control of nuclear power.

Cold WarUnited States Department of StateAcheson-Lilienthal ReportNuclear power

First Indochina War: In the Battle of Mạo Khê, French Union forces, led by World War II hero Jean de Lattre de Tassigny, inflict a defeat on Việt Minh forces commanded by General Võ Nguyên Giáp.

First Indochina WarBattle of Mạo KhêFrench UnionJean de Lattre de TassignyViệt Minh

The State Council of the People's Republic of China dissolves the government of Tibet.

State Council of the People's Republic of ChinaHistory of Tibet (1950-present)

Brazilian high school student Edson Luís de Lima Souto is killed by military police at a protest for cheaper meals at a restaurant for low-income students.

Edson Luís de Lima Souto

Greek poet and Nobel Prize laureate Giorgos Seferis makes a famous statement on the BBC World Service opposing the junta in Greece.

Nobel Prize in LiteratureGiorgos SeferisBBC World Service

An earthquake strikes western Turkey at about 23:05 local time, killing 1,086 and injuring 1,260.

1970 Gediz earthquakeTurkey

The US Supreme Court hands down 5-3 decision in Stump v. Sparkman, a controversial case involving involuntary sterilization and judicial immunity.

Supreme Court of the United StatesStump v. SparkmanHuman sterilizationJudicial immunity

Roman emperor Caligula accepts the titles of the Principate, entitled to him by the Senate.

Roman emperorCaligulaPrincipateSenate